....the dwarves are certainly makers and artists, but Thorin particularly? I don't know. It isn't Thorin particularly who sings 'Far over the misty mountains' - in fact, we're not told specifically that Thorin is singing at all, though I daresay he is. But all Tolkien says is 'first one dwarf and then another' began to sing, so the 'fierce and jealous love' which Bilbo senses in the song is a dwarvish characteristic, I'd say, not something personal to Thorin - though I agree with you completely that that's a magical piece of writing and it gets to me too.